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OPTICAL FIBRE CABLE
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OFC Manufacturing process flow
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Testing of Optical fibre Cables
Optical Tests Physical parameters Mechanical Tests Environment Tests
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OPTICAL PARAMETERS -ITU-T G 652
SPECIFICATIONS UNITS Attenuation at nm < 0.38 dB/km Attenuation at 1550nm < 0.25 Attenuation at 1330nm < 0.4 Mode field Diameter microns Point discontinuity < 0.1 dB Cut-off wavelength 1160 – 1310 nm
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OPTICAL PARAMETERS -ITU-T G 655
SPECIFICATIONS UNITS Attenuation at 1550nm < 0.25 dB/km Attenuation at 1625nm Attenuation at 1383± 3 nm < 1.0 Mode field Diameter 9.2-10 microns Point discontinuity at 1550nm < 0.1 dB Cut-off wavelength <1260 nm
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DISPERSION –ITU-T G 652 PARAMETERS SPECIFICATIONS UNITS
nm band < 5.3 ps/nm.km nm band < 3.5 1550 nm < 18 Slope < 0.092 ps/nmsq.km Zero Dispersion wavelength nm PMD at 1310 & 1550 < 0.2 ps/sqrt.km
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DISPERSION –ITU-T G 655 PARAMETERS SPECIFICATIONS UNITS 1530nm >0.1
ps/nm.km 1565nm 4 - 6 nm 4 – 11.2 Slope < 0.08 ps/nmsq.km PMD at 1550 < 0.2 ps/sqrt.km
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Geometrical Parameters –ITU-T G 652
SPECIFICATIONS UNITS Mode field Concentricity error < 0.8 microns Mode field non circularity < 12 % Clad Diameter 125 ± 1 Clad non circularity < 1 % Coat Diameter 245±10
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Geometrical Parameters –ITU-T G 655
SPECIFICATIONS UNITS Mode field Concentricity error < 0.5 microns Mode field non circularity < 12 % Clad Diameter 125 ± 1 Clad non circularity < 1 % Coat Diameter 245±10
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Mechanical Parameter –ITU-T G 652
PARAMETERS SPECIFICATIONS UNITS Proof Test 1 % Fibre Curl 4 M Dynamic Fatigue 20 Static Fatigue Stripping Force 1.3 – 9.8 N
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Testing of Optical Fibres
1. Mode field diameter 2. Clad diameter 3. Clad non circularity / Ovality 4. Mode field concentricity error 5. Diameter over primary coated fibre 6. Attenuation and Spectral attenuation 7. Chromatic dispersion 8. Polarization mode dispersion 9. Cut-Off Wave length 10. Microbend test on mandrel
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Mechanical Test - I OFC Abrasion Test Crush Test Impact Test
Tensile Strength Test Abrasion Test Crush Test Impact Test Repeated Bend Test Torsion Test Kink Test Cable Bend Test
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Mechanical Test –II OFC
Static bend Water Penetration Test Drip Test Embrittlement Test of loose tube Kink resistance test on loose tube Drainage test of loose tube Check for easy removal of sheath Effect of aggressive media on the cable jacket Flexural Rigidity Figure “8” test
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Physical & Environmental Test - OFC
Sheath Thickness Cable Diameter Cable performance from –40 to + 70 deg C
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Optical Test - OFC Attenuation at 1550nm
Attenuation at 1625nm for ITU-T G 652 Fibre Point discontinuity at 1550nm Optical Length of cable PMD of cables fibre Chromatic dispersion
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CABLE CONSTRUCTIONS
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[Cable Designs] UNITUBE BURIAL CABLE MULTITUBE BURIAL CABLE
OUTER SHEATH (NYLON) STRENGTH MEMBER(ARAMID YARN) INNER SHEATH (HDPE) OPTICAL FIBRE IN LOOSE TUBE STRENGTH MEMBER (GI WIRE) MULTITUBE BURIAL CABLE OUTER SHEATH (HDPE) CCST ARMOUR INNER SHEATH (HDPE) FLOODING JELLY CENTRAL STRENGTH MEMBER (FRP) OPTICAL FIBRE IN LOOSE TUBE
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[Cable Designs] UNITUBE DUCT CABLE MULTITUBE DUCT CABLE
OUTER SHEATH (NYLON) STRENGTH MEMBER ( FRP) INNER SHEATH (HDPE) OPTICAL FIBRE LOOSE TUBE MULTITUBE DUCT CABLE OUTER SHEATH (NYLON) INNER SHEATH (HDPE) WATER SWELLABLE TAPE CENTRAL STRENGTH MEMBER (FRP) OPTICAL FIBRE IN LOOSE TUBE
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[Cable Designs] Premises Distribution Cable [PDC] OUTER JACKET (LSOH)
OPTICAL FIBRE IN LOOSE TUBE ARAMID YARN
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48F METAL FREE OPTICAL FIBRE CABLE
Loose Tube FRP Rod Thixotropic jelly Flooding Jelly Polyester Tape GFR Yarns Rip Cord HDPE PA-12
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48F METAL FREE OPTICAL FIBRE CABLE
No. of Loose Tubes 6 Nos No. of Fibres per Loose Tube 8 Nos Colour of Loose Tubes Blue , Orange & Natural ( 4 Nos.) Colour of Fibres in Loose Tube Blue ,Orange , Green , Brown , Slate , White , Red & Natural Diameter of Cable 12.6 ± 0.5mm Weight of Cable 130 kg / km Packing Length 2 k.m ± 10 % * : Typical values which may vary as per Customer Spec
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48 FIBRE DUCT OFC ( RIBBON TYPE )
12 Fibre Ribbon Thixotropic Jelly Loose Tube FRP Rod Flooding Jelly Polyester Tape Rip Cord HDPE Sheath PA-12 Jacket
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